Ok, I am very new to this computer building things and I am not sure on how to approach this one problem. I am planning on getting a 7770 and in the future maybe having a crossfire system. My only question is, what is the difference between x16 and x4? Will there be a performance drop?
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You will get more bandwith with the PCI-e x16 slot, and more bandwith is better for gpu's, so go with the x16 slot.
So if I put another GPU in the other slot, I would not get much of a performance increase?